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Return a bool-type array, the same shape as x, True where x==+/-inf, False everywhere else.

Parameters :

x : array_like

Input values

out : array_like, optional

An array with the same shape as x to store the result.

Returns :

y : bool (scalar) or bool-type ndarray

For scalar input, the result is a new boolean with value True
if the input is positive or negative infinity; otherwise the value
is False.

For array input, the result is a boolean array with the same
shape as the input and the values are True where the
corresponding element of the input is positive or negative
infinity; elsewhere the values are False. If a second argument
was supplied the result is stored there. If the type of that array
is a numeric type the result is represented as zeros and ones, if
the type is boolean then as False and True, respectively.
The return value y is then a reference to that array.